在下拉选项更改时执行“执行”块

You can configure activities inside the Do block to execute when the dropdown option changes.

教程

要使用此功能，请执行以下操作：

1. Add the Create Form activity to your workflow.

2. Inside the Do block, configure the desired activities.

3. Open the Form Designer from the Create Form activity.

4. Drag and drop a Drop-down List component.

5. In the Data tab > Data Source Values section, add your dropdown options.

6. Scroll down to the Custom Default Value section and expand it.

7. In the JavaScript subsection, enter the following JavaScript code:

   const updateOnChange = instance.updateOnChange;
   instance.updateOnChange = function(flags, changed) {
       if (flags.modified) {
           instance.emit('dropdownChanged', 'drop');
       }
       return updateOnChange.call(instance, flag, changed);
   }
   

   当下拉选项更改时，上面的代码片段会触发执行“执行”块中的活动。

8. 保存表单。

9. At runtime, when you change the dropdown option, notice the activities in the Do block being executed.

示例工作流

要查看完整的工作流或供日后参考，请下载XAML 示例